Tweak pool handling of the status walker to remove an old-style subpool from
the walker. To reduce memory for repository status use a per directory pool,
to limit the status hash lifetime.

* subversion/libsvn_wc/status.c
  (get_dir_status): Remove local subpool.
  (make_dir_baton): Create pool for baton.
  (close_directory): Don't set text to added. Use scratch pool.
    Destroy pool.
  (close_file): Don't set text to added. Document 0 value.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1434940 13f79535-47bb-0310-9956-ffa450edef68